Attenuating out of band energy emitted from seismic sources
AssigneeWesternGeco L.L.C.
InventorsJon-Fredrik Hopperstad, Robert Laws, Julian Edward (Ed) Kragh
Life of this patent
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Abstract
A method for attenuating out of band energy emitted from a seismic source used in a marine seismic survey. The method includes disposing the seismic source in a body of water and releasing a gas into a volume of water surrounding the seismic source. The released gas may be configured such that it displaces the volume of water surrounding the seismic source at a rate less than 2.9×106 cubic-meters per cubic-second.
Claims20
A seismic source for marine seismic acquisition, comprising:
- An outer cylinder having one or more apertures;
- An inner cylinder having one or more apertures configured to align with the apertures of the outer cylinder at one or more predetermine rotational positions of the inner cylinder, wherein an outer wall of the inner cylinder is flush with an inner wall of the outer cylinder;
- An axis bar coupled to the inner cylinder, wherein the axis bar rotates the inner cylinder;
- A gas supply coupled to the inner cylinder, wherein the gas supply provides a compressed gas inside the inner cylinder;
- and an actuator coupled to the axis bar, wherein the actuator controls a rate of rotation of the inner cylinder that would release the compressed gas into a volume of water surrounding the seismic source such that the volume of water surrounding the seismic source is displaced at less than a predetermined rate, by which an out of band frequency emitted by the seismic source is attenuated.
A method for attenuating out of band energy emitted from a seismic source used in a marine seismic survey comprising:
- Disposing the seismic source in a body of water, wherein the seismic source comprises?:
- An outer cylinder;
- An inner cylinder, wherein an outer wall of the inner cylinder is flush with an inner wall of the outer cylinder;
- An axis bar coupled to the inner cylinder, wherein the axis bar rotates the inner cylinder;
- An actuator coupled to the axis bar, wherein the actuator controls a rate of rotation of the inner cylinder;
- and
- A gas supply coupled to the inner cylinder, wherein the gas supply provides a compressed gas inside the inner cylinder;
- and
- Sending a command to the actuator to release the compressed gas into a volume of water surrounding the seismic source such that the volume of water surrounding the seismic source is displaced at less than a predetermined rate, by which an out of ban frequency emitted by the seismic source is attenuated.
Dependencies are inferred from the claim text.